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Looks like 12346290 is the undiluted coolant and 12378390 is a 50/50 premix (50% coolant, 50% distilled water). Both compatible, but if you buy the first one, you are advised to mix it down to 50/50 yourself.

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12-30-2022, 10:20 PM	#2
arpad_m Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017 Location: East Tennessee Posts: 13,449 View My Garage	Looks like 12346290 is the undiluted coolant and 12378390 is a 50/50 premix (50% coolant, 50% distilled water). Both compatible, but if you buy the first one, you are advised to mix it down to 50/50 yourself. __________________ 2018 Camaro 2SS — G7E MX0 NPP F55 IO6 735 rwhp \| 665 rwtq Magnuson TVS 2300 80mm pulley \| Kooks 1 7/8" LT headers \| JRE smooth idle Terminator cam \| LT4 FS & injectors \| TSP forged pistons & rods JMS PowerMAX \| DSX flex fuel kit \| Roto-Fab CAI \| Soler 95mm LT5 TB \| 1LE wheels \| 1LE brakes \| BMR rear cradle lockout \| JRE custom tune 1100 - 1/30/18 \| 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 \| 3800 - 2/26/18 4300 - 2/27/18 \| 4B00 - 3/01/18 4200 - 3/05/18 \| 4800 - 3/14/18 5000 - 3/16/18 \| 6000 - 3/19/18